Surface measurements on gallium arsenide

Surface photovoltage phenomena: theory, experiment, and applications

“…69, Flinn and Briggs used 5 ms illumination pulses because the use of pulsed illumination greatly reduced sample heating. However, they reported a SPV relaxation time of the order of minutes [561]. Thus, the V 0 s values reported by them may underestimate the real ones, even in curves where good saturation with illumination intensity was observed.…”

“…An example is given in Fig. 69, which shows the photosaturation measurements of Flinn and Briggs on n-and p-type GaAs(1 1 1) samples, exposed to different gases [561]. It is readily observed that the SPV does not saturate for any of the p-type samples or for the nitrogen exposed n-type samples.…”

“…In yet a third group of studies, photosaturation was obtained for some, but not all, surface conditions [412,556,558,561,575]. This third kind is the most interesting, as it provides a key for understanding the effects which govern the elusive photosaturation behavior.…”

Controlling the Work Function of CdSe by Chemisorption of Benzoic Acid Derivatives and Chemical Etching

“…Although photosaturation is an established technique, [15][16][17][18][19][20] recent work on the measurement of quasi-Fermi levels21 evoked discussion as to whether or not photosaturation measurements are affected by these levels. This question can be answered by taking into consideration two facts.…”